linux-kernel - Re: [PATCH v2 2/6] genirq/test: Factor out fake-virq setup

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Message-ID: <bbd30cfb-eadd-49bd-b01c-6cc88d9243b6@roeck-us.net>
Date: Fri, 22 Aug 2025 18:13:27 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Brian Norris <briannorris@...omium.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, David Gow <davidgow@...gle.com>,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	kunit-dev@...glegroups.com
Subject: Re: [PATCH v2 2/6] genirq/test: Factor out fake-virq setup

On Fri, Aug 22, 2025 at 11:59:03AM -0700, Brian Norris wrote:
> We have to repeat a few things in tests. Factor out the creation of fake
> IRQs.
> 
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> Reviewed-by: David Gow <davidgow@...gle.com>

Tested-by: Guenter Roeck <linux@...ck-us.net>

> ---
> 
> (no changes since v1)
> 
>  kernel/irq/irq_test.c | 45 +++++++++++++++++++------------------------
>  1 file changed, 20 insertions(+), 25 deletions(-)
> 
> diff --git a/kernel/irq/irq_test.c b/kernel/irq/irq_test.c
> index e220e7b2fc18..f8f4532c2805 100644
> --- a/kernel/irq/irq_test.c
> +++ b/kernel/irq/irq_test.c
> @@ -41,15 +41,15 @@ static struct irq_chip fake_irq_chip = {
>  	.flags          = IRQCHIP_SKIP_SET_WAKE,
>  };
>  
> -static void irq_disable_depth_test(struct kunit *test)
> +static int irq_test_setup_fake_irq(struct kunit *test, struct irq_affinity_desc *affd)
>  {
>  	struct irq_desc *desc;
> -	int virq, ret;
> +	int virq;
>  
> -	virq = irq_domain_alloc_descs(-1, 1, 0, NUMA_NO_NODE, NULL);
> +	virq = irq_domain_alloc_descs(-1, 1, 0, NUMA_NO_NODE, affd);
>  	KUNIT_ASSERT_GE(test, virq, 0);
>  
> -	irq_set_chip_and_handler(virq, &dummy_irq_chip, handle_simple_irq);
> +	irq_set_chip_and_handler(virq, &fake_irq_chip, handle_simple_irq);
>  
>  	desc = irq_to_desc(virq);
>  	KUNIT_ASSERT_PTR_NE(test, desc, NULL);
> @@ -57,6 +57,19 @@ static void irq_disable_depth_test(struct kunit *test)
>  	/* On some architectures, IRQs are NOREQUEST | NOPROBE by default. */
>  	irq_settings_clr_norequest(desc);
>  
> +	return virq;
> +}
> +
> +static void irq_disable_depth_test(struct kunit *test)
> +{
> +	struct irq_desc *desc;
> +	int virq, ret;
> +
> +	virq = irq_test_setup_fake_irq(test, NULL);
> +
> +	desc = irq_to_desc(virq);
> +	KUNIT_ASSERT_PTR_NE(test, desc, NULL);
> +
>  	ret = request_irq(virq, noop_handler, 0, "test_irq", NULL);
>  	KUNIT_EXPECT_EQ(test, ret, 0);
>  
> @@ -76,17 +89,11 @@ static void irq_free_disabled_test(struct kunit *test)
>  	struct irq_desc *desc;
>  	int virq, ret;
>  
> -	virq = irq_domain_alloc_descs(-1, 1, 0, NUMA_NO_NODE, NULL);
> -	KUNIT_ASSERT_GE(test, virq, 0);
> -
> -	irq_set_chip_and_handler(virq, &dummy_irq_chip, handle_simple_irq);
> +	virq = irq_test_setup_fake_irq(test, NULL);
>  
>  	desc = irq_to_desc(virq);
>  	KUNIT_ASSERT_PTR_NE(test, desc, NULL);
>  
> -	/* On some architectures, IRQs are NOREQUEST | NOPROBE by default. */
> -	irq_settings_clr_norequest(desc);
> -
>  	ret = request_irq(virq, noop_handler, 0, "test_irq", NULL);
>  	KUNIT_EXPECT_EQ(test, ret, 0);
>  
> @@ -118,17 +125,11 @@ static void irq_shutdown_depth_test(struct kunit *test)
>  	if (!IS_ENABLED(CONFIG_SMP))
>  		kunit_skip(test, "requires CONFIG_SMP for managed shutdown");
>  
> -	virq = irq_domain_alloc_descs(-1, 1, 0, NUMA_NO_NODE, &affinity);
> -	KUNIT_ASSERT_GE(test, virq, 0);
> -
> -	irq_set_chip_and_handler(virq, &dummy_irq_chip, handle_simple_irq);
> +	virq = irq_test_setup_fake_irq(test, &affinity);
>  
>  	desc = irq_to_desc(virq);
>  	KUNIT_ASSERT_PTR_NE(test, desc, NULL);
>  
> -	/* On some architectures, IRQs are NOREQUEST | NOPROBE by default. */
> -	irq_settings_clr_norequest(desc);
> -
>  	data = irq_desc_get_irq_data(desc);
>  	KUNIT_ASSERT_PTR_NE(test, data, NULL);
>  
> @@ -181,17 +182,11 @@ static void irq_cpuhotplug_test(struct kunit *test)
>  
>  	cpumask_copy(&affinity.mask, cpumask_of(1));
>  
> -	virq = irq_domain_alloc_descs(-1, 1, 0, NUMA_NO_NODE, &affinity);
> -	KUNIT_ASSERT_GE(test, virq, 0);
> -
> -	irq_set_chip_and_handler(virq, &fake_irq_chip, handle_simple_irq);
> +	virq = irq_test_setup_fake_irq(test, &affinity);
>  
>  	desc = irq_to_desc(virq);
>  	KUNIT_ASSERT_PTR_NE(test, desc, NULL);
>  
> -	/* On some architectures, IRQs are NOREQUEST | NOPROBE by default. */
> -	irq_settings_clr_norequest(desc);
> -
>  	data = irq_desc_get_irq_data(desc);
>  	KUNIT_ASSERT_PTR_NE(test, data, NULL);
>  
> -- 
> 2.51.0.rc2.233.g662b1ed5c5-goog
>